Transferred to DPHEP area on DESY dCache. 2 tape copies (different media generations 1.2 PiB) plus disk cache (700 TiB) for on-going analyses. A copy of the ZEUS data is also available at MPCDF (Munich) and further copies are under consideration.

Documentation:

Non-digital documentation catalogued and stored in the DESY library archive; some digitized. Collaboration software notes in INSPIREHEP. Important internal web pages collected to a web-server with static content.

Software:

“In the best of all worlds we would keep the software alive i.e. compilable on the latest Linux with the latest library versions”

We now follow a “freezing approach”, i.e. a VM with isolated storage and well defined set of external libs

Use Cases:

Continued analyses by members of the HERA collaborations

Audience:

Primarily the HERA collaborations, but also other physicists interested in HERA data

Value:

Analyses, publications and PhDs continue to be produced

Uniqueness:

Unique combination of initial state particles and energy

Status:

Transitioning from experiment-specific to institutional solutions

Issues:

Webservers: tension between production needs and long-term archiving.

Do not underestimate the effort! Experiment expertise fades away quickly once funding stops.

Data preservation must be prepared whilst effort is available!

Outlook:

Continued ability to analyse data until 2020 (when support for SL6 stops); Migration to SL7 could extend this; Tape archive will life on.